Stop-motion device for sewing-machines.



PATENTED AUG. 13

E. B. ALLEN. STOP MOTION DEVICE FOR SEWING MACHINES.

APPLICATION FILED 0011.30. 1906.

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wit cooeo PATENTED AUG. 13, 1907. E. B. ALLEN. STOP MOTION DEVIGEJOB. SEWING MACHINES.

APPLICATION FILED 00T.30. 1906.

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witneoaeoi V No. 868,129. PATENTED AUG. 13, 1907.

E. B. ALLEN. STOP MOTION DEVICE FOR SEWING MACHINES.

APPLICATION FILED 00T.30. 1906.

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PATENTED AUG. 13, 1907? E. B. ALLEN. 7 STOP MOTION DEVICE FOR SEWING MACHINES.

APPLIGATION FILED OUT-30. 1906.

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APPLIOATION FILED 00T.30. 1906.

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PATENTED AUG. 13, 190i ,E. B. ALLEN. STOP MOTION DEVICE FOR SEWING MACHINES.

APPLIOATION FILED QOT.30. 1906.

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an under witnesses UNITED STATES Farsi onion.

EDWARD B. ALLEN, OF BRIDGEPORT, CONNECTICUT, AS SIGNOB TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

STOP-MOTION DEVICE FOR SEWING-MACEANES.

Specification of Letters Patent.

'Paten'ted Aug. 13, 1907.

Original application filed March 7, 1906, Serial No- 304,732. Divided and this application filed October 80,1906.

' Serial No. 841,202.

To all whom it may concern:

field and State of Connecticut, have invented or discovered certain new and'useful'lmprovements in Stop-Motion Devices for Sewing-Machines, of which the following isa specification, reference being had therein to the accompanying drawings. 7

This invention relates to a startand stop-motion device for sewing machir'ies, and more especially for button-hole stitching machines, such, for example, as that fully shown and described in my application No. 304,732, filed March 7, 1906, and of which this application is a division.

Referring tothe drawings, Figure 1 is a vertical longitudinal section of a button-hole machine embodying the present invention. Fig. 2 is a side view of the same with the upper part of the frame in dotted lines. I Fig. 3 is a horizontal sectional view of the same, looking down. Fig. 4 is a rear end view of the same. Fig. 5'is a detail perspective view of parts of the stop-motion device. Figs. 6 to 9, inclusive, are detail views of a continuously rotating wheel and the switch-tappet carried thereby, and Figs. 10 to 15, inclusive, are detail views of the start-and stop-motion clutch.

Referring to the drawings, 12 denotes the base of the machine and 13'the bracket-arm surmounting said base,

said parts constituting the stationary frame of the machine on which the stitch-forming devices are preferably rotatively mounted, soas to' be adapted to be ,turned, and on which the work-supporting and buttonhole cutting devices are movably mounted. Journaled in the. said base 12'is the main or driving shaft 14 on which is loosely mounted the driving pulley '15 having a suitable clutch connection with said shaft. I The driving shaft 14 is constructed with twin quartering cranks 21 connected by pitmen 22 with similar cranks 23 on the rotating needle-bar shaft24 journaled in the upper part of the arm and'provided at its forward 'end with cranks connected by pitmen with two out-of time needle-bars 25 carrying needles 26; said needleand described in said U. s. Patent No. 734,794, said loop-taking devices being mounted on a rotatable car: rier 29 provided with'a pinion 30 by which it may be turned;

The upper plates or feet 37 of the work-holding clamp are carried at the forward ends of clamp-arms 38 attached to rocking blocks 39 pivotally mounted on plates or blocks 40 secured to the plates 36. J ournaled in suitable bearings at the rear ends of the lower clamping plates 35 is a rock-shaft 40* provided with earns 41 against which blocks 42 at the rear ends of the clamp arms 38 are pressed by suitable springs which serve to open the clamp by lifting .the forward ends of said rear end of the bar 49 is held yieldingly downward by a spring 51, and said bar is provided on its under side with a shoulder 52 for engagement with one arm of a tripping lever 53 the other arm of which, when the machine is running, is engaged by a retaining hooked arm 54 of a with the tripping lever 53, as shown in Fig. 4, will be above and entirely clear of-the hub 110 formed on the constantly-running gear cam wheel 17. The hub 110 is provided with a recess having a mouth which is open to one part of the periphery of said hub, said recess being for the reception of a switch-tappet 111 pivotally mounted on an eccentric sleeve 112 with which said wheel- 17 is provided, the spacearound said switchtappet, within said hub, affording a cam-track adapted to 'receive'said' stud 109'. The 'switch-tappet 111 is provided at its inner side with 9. lug 113 against which presses a spring 114, housed within the wheel 17, to normally hold said switch-tappet in the position shown in Figs. 4 and 6; but when the tripping lever, 53 is disrows in Figs. -6, 7 and 8, said stu d will now enter the track outside of the switch-tappet,.as denoted in full lines in Fig. 6, lowering the starting lever 55 to theposition shown inFig. 5. The continued-rotationlof the engaged from the hooked arm 54 of the starting lever wheel 17 brings the parts to the position shown in Figs. 1 7 and 8, and as the switch-tappet 111 engages the stud 109, as in Fig. 7, the said switch-tappet will lift the said stud clear of the hub 110 and in so doing said switch-tappet will-yield against the stress of the spring 115 and eject the said stud from the open mouth in the cam-track in the said hub 110. (See Fig. 8). This lifting movement of the said stud raises said starting lever to the position shown in Fig. 4, thereby starting the machine. I From the foregoing it will be understood that the operation of closing the clamp operates the trippinglever 5.3 so as to release the starting lever 55.

For the purpose of releasing the tripping-lever 53' ward, when the work-clamp is closed, the rear end of said bar abuts against said latch and forces the same outward to the position shown in dotted lines in Fig. 2; but when the starting lever is moved downward, as above described, the said latch is returned by its spring 117 to its normalposition relative to the hooked arm 54 by which it is carriedfand when insuch normal positionsaid latch will be beneath the rear end of said trippingbar when the starting lever is lowered. From this construction and arrangement of parts it results that when the starting lever is performing its upward or machine-starting movement, as will presently be described, the latch 116 will lift the rear end of the said tripping-bar so a's to disengage the latter from the saidtripping-lever and so that the said lever will then be instantly returned, by the torsional spring 118, to

itslnormal position with one arm in engagement with the stop-pin 119; and at the last part of the upward 'movement of the starting lever the incline at the top ,I. of the hooked arm 54 rides past the retaining arm of the spring-pressed tripping lever so that the said retaining arm will now snap beneath the shoulder of the'hook and thereby lock the starting lever in its raised p0sition. It will thus be understood that after a single vibration of the starting lever the latter will be locked to prevent a second vibrationthereof until said lever is next tripped by the opening of the-clamp. When the work-clamp is opened torelease the worlq, alter a therewith, the said clutch-wheel extending within said pulley which is suitably recessed or chambered for its reception. The clutch-wheel 120 is recessed at one portion of its periphery for the reception of a clutch-plate 121 interposed-between said wheel and the wall of the chamber in the said loose pulley, said wheel also having a segmental recess 122, inside of said plate, for the reception, of a cam projection 123 on a clutch-ring 124 which has a pivotal connection with v the said clutch-wheel by means of said projection, so' that the said clutch-ring mayswing slightly relative to said clutch-wheel on said projection as a center or pivot, thus causing the cam or flattened outer portion of said projection to clamp said clutch-plate tightly ag'ainst'the wall of the chamber in the pulley 15-when the latter is to be connected to the driving shaft 14.

The clutch-ring 124 is-provided with a pin 125 extending within a recess 126 in the clutch-wheel 120 and which recess also receives a spring 127, bearing against said pin 125 so as to force the parts into the clutch-. ing position in Fig 11. The said clutch-ring 124 is provided at its periphery with a notch 128 for the reception of a lug or projection 129 on a vertically mov able block 130 carried by the stop-motion lever 131* pivotally mounted in'a bracket 132 on the base or frame of the machine; a spring 133 housed in a recess in said lever serving to press said block yieldingly downward, and the said clutch-ring being provided with an eccentric or cam-portion 134 to engage said lug or projection 129 to lift the same so that it can fall into said notch 128, to swing said clutch-ring slightly in opposition to the stress of the spring 127, to release the said clutch-plate when thestop-motion lever has been tripped and the machine is to be stopped. The clutch- 9 5 ring 124 is connected with the clutch-wheel 120 by a' small plate 135 attached to the cam projection 123 and slightly overlapping the eccentric circular portion of the latter circumferentially. I

The intermittingly rotating work-clamp feeding cam-wheel 66, on the shaft 65, is provided with a tripping lug or projection 136 preferably carried by a plate 137 adjustably attached to said wheel said lug or pro- .jection being arranged toengage the inner arm of a carried by said stop-motion lever, into position to e ngage the clutch-ring 124, and thus release the clutch, as hereinbefore indicated, for the stopping operation.

The stop-motion lever is provided with a friction pad 142, preferably bf raw-hide or other suitable non-metallic material, which is arranged to bepressed into contact with the outer face of the clutch-ring 124 when the said stop-motion lever is first tripped, and thus retard the speed of rotation of the clutch-wheel prior to the final positive stop of said wheel, and which positive step occurs when the lug or projection 129 enters the notch 128 in the said clutch-ring.

The stop-motion lever 131 is pivotally mounted in the bracket 132 by means of arock-shaftf143 to which said lever is'rigidly attached, and the said rock-shaft is provided with a starting a'rn1'144 also rigidly attached l3 0 1 I to said shaft and carrying a pivoted dog 145 having an inclined inner face for engagement with the inclined ward the said dog will yield or turn against the stress of said spring 148, and thus permit the rigid projection 146 on said starting-lever to pass by said dog without moving the starting arm 144; .but when said starting lever is moved upward the incline on the said starting lever will engage the incline on the said dog (which is now held rigid by the said stop-pin 149) and thus force the starting-arm outward, such outward movement of said-starting-arm swinging the lower arm of the stop-motion lever outward, thereby disengaging the lug or projection 129, carried by-said'arm, from the notch 1-28 in the clutch-ring 124 so as to allow the spring 127 to force the clutching parts into holding engagement with each other to set the machine in motion. As the lower arm of the stop-motion lever moves outward its upper arm' moves inward so, as to be engaged by the'retaining hook of'th elatch-lever 138 which will then hold the said stop-motion lever in its inoperative position until the said latch-lever is again tripped by the lugor projection 136 on the feed wheel, at the completion of the next button-hole.

Having'thus described my invention I claim and mouth, a spring-pressed switch-tappet in said recessed part. a starting-lever having a stud to enter the cam-track in said recessed part afforded by the said switch-tappet, retaining and tripping means for said startingiever, a startand stop-motion device adapted'to be tripped, to set the machine running, by said starting lever, and a work-clamp and connections whereby when said work-clamp is closed said starting lever will he released.

2. in a button-hole stitching-machine, the combination with stitch-forming devices, of a. 'startand stop-motion device for said stitch-forming devices, a continuously-rotating wheel having a recessed hub part provided with a radially opening'mouth, a spring-pressed switch tappet in said recessed part, a pin or stud to enter the cam-track afforded by the said 'switch-tappet in said recessed part, and means. operated from said pin or stud, for controlling said startand stop-motion device for starting saidstitchforming devices into operation.

3. In a button-hole stitching machine, the combination with a stitch-forming mechanism, and a startand stop: motion device comprising a starting'lever provided with a stud or projection, of a continuously-running, springpressed switch-tappet arranged to engage said stud or pro jecizion and thereby operate said starting lever to set siiid stitch-forming mechanism into action.

4. In a hutton-hole, stitching machine, the combination with a stitch-forming mechanism, of a startand stop-motion mechanism for said stitch-forming mechanism comprising a starting-lever having a pin or stud, a continuously-rotating spring-pressed .switch-tappet, and controlling nieans whereby said pin or stud may be operatively F. W. Osrnon, E. -L. Tonnes. 

